贵州罗甸软玉矿辉绿岩岩浆热液成矿规律研究  

A Study on the diabase magma derived hydrothermal metallogenic regularity of the Luodian nephrite deposit in Luodian County,Guizhou Province,China

作　　者：王景腾 尚志辉 刘俊 张洪信[3] WANG Jing-teng;SHANG Zhi-hui;LIU Jun;ZHANG Hong-xin(Southwest Energy and Mineral Inc.Co.,Ltd.,Guiyang 550001,China;Guizhou Shengshi Jade Industry Co.Ltd.,Guiyang 550001,China;No.117 Geological Brigade,Guizhou Bureau of Geology and Mineral Resources Exploration and Development,Guiyang 550018,China)

机构地区：[1]西南能矿集团股份有限公司,贵州贵阳550001 [2]贵州盛世玉业股份有限公司,贵州贵阳550001 [3]贵州省地质矿产勘查开发局117地质大队,贵州贵阳550018

出　　处：《矿物学报》2022年第1期83-94,共12页Acta Mineralogica Sinica

摘　　要：根据近年来贵州罗甸软玉矿勘查获得的地质成果及前人研究成果,通过对矿床及其密切相关的辉绿岩体地质、地球化学特征的分析,总结了软玉矿辉绿岩岩浆热液成矿规律。研究认为,透闪石是软玉矿成玉的主要矿物,是由交代作用形成的新生矿物,其重要组分MgO和Na2O由侵入的基性岩浆气液带来。透闪石化越强,对成玉矿越有利。辉绿岩体中MgO含量产生双向迁移及单向迁移后形成软玉矿的可能性大,没有明显的扩散迁移作用,形成软玉矿的可能性小。当岩浆气液成矿流体作用在岩体接触带交代围岩从内向外形成辉石角岩相、角闪角岩相和钠长-绿帘角岩相三者形成变质岩石相序列组合时,在角闪角岩相带含矿的机率较高。在野外工作中,辉绿岩中的杏仁状构造和气孔状构造可作为软玉矿的重要找矿标志,大理岩化带可作为软玉矿的一般找矿标志。Based on results of the geological exploration and previous researches of the Luodian nephrite deposit in Luodian County, Guizhou Province in recent years, in this paper, we have summarized the diabase magma derived hydrothermal metallogenic regularity of the Luodian nephrite deposit by analyzing the geological and geochemical characteristics of the deposit and its closely related diabase intrusion. The results show that tremolite is the main mineral component of the nephrite, and it was a new mineral formed by metasomatism, with its important components of MgO and Na2O sourced from the intrusive basic magma derived gas and liquid. The stronger the tremolotization is, the more favorable it is to the formation of jade ore. The bidirectional and unidirectional migration of the MgO from diabase has resulted in the high possibility of nephrite formation. Without obvious diffusion and migration of MgO, the possibility of nephrite formation is quite small. When wallrocks were metasomatized by the magmatic hydrothermal ore-forming fluid occurred in the contact zone between the intrusion and wallrocks a series of metamorphic lithofacies including pyroxene hornfels facies, amphibole hornfels facies, and albite-epidote hornfels facies were formed from the inner to outer contact zone. The ore-bearing probability in the amphibole hornfels facies is higher than those of other facies. In the field, the mygdaloidal and the porous structures in diabase can be used as important nephrite prospecting indicators, while the marbleization zone can be used as the ordinary nephrite prospecting indicator.

关 键 词：找矿标志 地球化学特征 成矿规律 软玉矿 贵州罗甸 

分 类 号：P595[天文地球—地球化学] P611[天文地球—地质学]